// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_PUBLIC_BROWSER_WEB_DRAG_DEST_DELEGATE_H_
#define CONTENT_PUBLIC_BROWSER_WEB_DRAG_DEST_DELEGATE_H_

#include "base/strings/string16.h"

namespace ui {
class OSExchangeData;
}

namespace content {
class WebContents;

// An optional delegate that listens for drags of bookmark data.
class WebDragDestDelegate {
public:
    // Announces that a drag has started. It's valid that a drag starts, along
    // with over/enter/leave/drop notifications without receiving any bookmark
    // data.
    virtual void DragInitialize(WebContents* contents) = 0;

    // Notifications of drag progression.
    virtual void OnDragOver() = 0;
    virtual void OnDragEnter() = 0;
    virtual void OnDrop() = 0;
    // This should also clear any state kept about this drag.
    virtual void OnDragLeave() = 0;

#if defined(USE_AURA)
    // Called at the start of every drag to supply the data associated with the
    // drag.
    virtual void OnReceiveDragData(const ui::OSExchangeData& data) = 0;
#endif // USE_AURA

    virtual ~WebDragDestDelegate()
    {
    }
};

} // namespace content

#endif // CONTENT_PUBLIC_BROWSER_WEB_DRAG_DEST_DELEGATE_H_
